I installed three of these blinds recently. They come with a plastic clip that needs to be screwed into the window for inside mounting. I was happy with this as we were able to adjust the predrilled holes to our requirements. We had to drill new holes because our windows were not as deep. 

The blind quality is nice and their size was described correctly. One issue I have with the blinds is that the leveling mechanism can very easily get misaligned. One of the blinds does not look level when pulled down (one side hangs lower than the other). Understand that we just put them up so it's not like we pulled them down so many times that we messed up the alignment. We seemed to have done this from the time we installed them. On account of this, be very careful when pulling them down and always pull evenly from the middle.